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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Timers based on win32 WaitableTimers
//!
//! This implementation is meant to be used solely on windows. As with other
//! implementations, there is a worker thread which is doing all the waiting on
//! a large number of timers for all active timers in the system. This worker
//! thread uses the select() equivalent, WaitForMultipleObjects. One of the
//! objects being waited on is a signal into the worker thread to notify that
//! the incoming channel should be looked at.
//!
//! Other than that, the implementation is pretty straightforward in terms of
//! the other two implementations of timers with nothing *that* new showing up.
use std::comm::Data;
use std::libc;
use std::ptr;
use std::rt::rtio;
use io::timer_helper;
use io::IoResult;
pub struct Timer {
priv obj: libc::HANDLE,
priv on_worker: bool,
}
pub enum Req {
NewTimer(libc::HANDLE, Sender<()>, bool),
RemoveTimer(libc::HANDLE, Sender<()>),
Shutdown,
}
fn helper(input: libc::HANDLE, messages: Receiver<Req>) {
let mut objs = ~[input];
let mut chans = ~[];
'outer: loop {
let idx = unsafe {
imp::WaitForMultipleObjects(objs.len() as libc::DWORD,
objs.as_ptr(),
0 as libc::BOOL,
libc::INFINITE)
};
if idx == 0 {
loop {
match messages.try_recv() {
Data(NewTimer(obj, c, one)) => {
objs.push(obj);
chans.push((c, one));
}
Data(RemoveTimer(obj, c)) => {
c.send(());
match objs.iter().position(|&o| o == obj) {
Some(i) => {
drop(objs.remove(i));
drop(chans.remove(i - 1));
}
None => {}
}
}
Data(Shutdown) => {
assert_eq!(objs.len(), 1);
assert_eq!(chans.len(), 0);
break 'outer;
}
_ => break
}
}
} else {
let remove = {
match &chans[idx - 1] {
&(ref c, oneshot) => !c.try_send(()) || oneshot
}
};
if remove {
drop(objs.remove(idx as uint));
drop(chans.remove(idx as uint - 1));
}
}
}
}
impl Timer {
pub fn new() -> IoResult<Timer> {
timer_helper::boot(helper);
let obj = unsafe {
imp::CreateWaitableTimerA(ptr::mut_null(), 0, ptr::null())
};
if obj.is_null() {
Err(super::last_error())
} else {
Ok(Timer { obj: obj, on_worker: false, })
}
}
pub fn sleep(ms: u64) {
use std::rt::rtio::RtioTimer;
let mut t = Timer::new().ok().expect("must allocate a timer!");
t.sleep(ms);
}
fn remove(&mut self) {
if !self.on_worker { return }
let (tx, rx) = channel();
timer_helper::send(RemoveTimer(self.obj, tx));
rx.recv();
self.on_worker = false;
}
}
impl rtio::RtioTimer for Timer {
fn sleep(&mut self, msecs: u64) {
self.remove();
// there are 10^6 nanoseconds in a millisecond, and the parameter is in
// 100ns intervals, so we multiply by 10^4.
let due = -(msecs * 10000) as libc::LARGE_INTEGER;
assert_eq!(unsafe {
imp::SetWaitableTimer(self.obj, &due, 0, ptr::null(),
ptr::mut_null(), 0)
}, 1);
let _ = unsafe { imp::WaitForSingleObject(self.obj, libc::INFINITE) };
}
fn oneshot(&mut self, msecs: u64) -> Receiver<()> {
self.remove();
let (tx, rx) = channel();
// see above for the calculation
let due = -(msecs * 10000) as libc::LARGE_INTEGER;
assert_eq!(unsafe {
imp::SetWaitableTimer(self.obj, &due, 0, ptr::null(),
ptr::mut_null(), 0)
}, 1);
timer_helper::send(NewTimer(self.obj, tx, true));
self.on_worker = true;
return rx;
}
fn period(&mut self, msecs: u64) -> Receiver<()> {
self.remove();
let (tx, rx) = channel();
// see above for the calculation
let due = -(msecs * 10000) as libc::LARGE_INTEGER;
assert_eq!(unsafe {
imp::SetWaitableTimer(self.obj, &due, msecs as libc::LONG,
ptr::null(), ptr::mut_null(), 0)
}, 1);
timer_helper::send(NewTimer(self.obj, tx, false));
self.on_worker = true;
return rx;
}
}
impl Drop for Timer {
fn drop(&mut self) {
self.remove();
assert!(unsafe { libc::CloseHandle(self.obj) != 0 });
}
}
mod imp {
use std::libc::{LPSECURITY_ATTRIBUTES, BOOL, LPCSTR, HANDLE, LARGE_INTEGER,
LONG, LPVOID, DWORD, c_void};
pub type PTIMERAPCROUTINE = *c_void;
extern "system" {
pub fn CreateWaitableTimerA(lpTimerAttributes: LPSECURITY_ATTRIBUTES,
bManualReset: BOOL,
lpTimerName: LPCSTR) -> HANDLE;
pub fn SetWaitableTimer(hTimer: HANDLE,
pDueTime: *LARGE_INTEGER,
lPeriod: LONG,
pfnCompletionRoutine: PTIMERAPCROUTINE,
lpArgToCompletionRoutine: LPVOID,
fResume: BOOL) -> BOOL;
pub fn WaitForMultipleObjects(nCount: DWORD,
lpHandles: *HANDLE,
bWaitAll: BOOL,
dwMilliseconds: DWORD) -> DWORD;
pub fn WaitForSingleObject(hHandle: HANDLE,
dwMilliseconds: DWORD) -> DWORD;
}
}
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